Financial Instruments Cross-currency forward-exchange contracts (Details) - Derivatives Designated as Hedging Instruments: - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Forward-starting interest rate swap contracts
Foreign Currency Fair Value Hedge Derivative [Line Items]
Unrealized gains on derivatives for net investment hedges, net of tax of $5 and $11 for the three months ended September 30, 2023 and 2022, respectively, and $1 and $24 for the nine months ended September 30, 2023 and 2022, respectively	$ 5	$ 30	$ 5	$ 77
Foreign exchange derivative instruments
Foreign Currency Fair Value Hedge Derivative [Line Items]
Unrealized gains on derivatives for net investment hedges, net of tax of $5 and $11 for the three months ended September 30, 2023 and 2022, respectively, and $1 and $24 for the nine months ended September 30, 2023 and 2022, respectively	$ 18	$ 39	$ 5	$ 84